CN103771452A - Square beta molecular sieve and preparing method thereof - Google Patents
Square beta molecular sieve and preparing method thereof Download PDFInfo
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- CN103771452A CN103771452A CN201210416292.8A CN201210416292A CN103771452A CN 103771452 A CN103771452 A CN 103771452A CN 201210416292 A CN201210416292 A CN 201210416292A CN 103771452 A CN103771452 A CN 103771452A
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Abstract
The invention relates to a square beta molecular sieve and a preparing method thereof. According to the method, cheaper natural mineral montmorillonoid with wider raw material source is adopted as a synthesis raw material, so that the purpose of low-cost synthesis of square beta molecular sieves is realized. Crystalline grains of the square beta molecular sieve are mostly and basically cuboid, and accordingly the beta molecular sieve with the form is outstanding in diffusion performance.
Description
Technical field
The invention belongs to molecular sieve and technology of preparing thereof.Specifically, relate to natural mineral polynite the required all or part of aluminium source of synthesizing quadrate beta-molecular sieve and part silicon source, the method for in-situ crystallization synthesizing quadrate beta-molecular sieve are provided.
Background technology
Beta-molecular sieve is the product (US3308069) that Wadlinger by Mobil company of the U.S. in 1967 etc. adopt classical hydrothermal crystallization method to synthesize first.Because the silicon source adopting is silicon sol, its water content is large, thereby causes template large usage quantity, causes beta-molecular sieve production cost higher.Simultaneously again due to whole reaction soln bulky, crystallization time is long, thereby bring the problems such as production efficiency is low, be unfavorable for large-scale commercial production.US5164170 adopts the synthetic macropore beta-molecular sieve of mixed templates (quaternary ammonium cation adds organic ammonium salt) to reduce its production cost.CN1108213A, CN1108214A have also announced a kind of directing agent method.It is template that the reports such as CN1084101A, CN1154341A, CN1154342A adopt tetraethylammonium cation, carries out branch's crystallization with wetting, has reduced the consumption of template, can be at lower ammonium-silicon ratio condition (TEA
+/ SiO
2=0.03 ~ 0.20) synthesizing high-silicon aluminum ratio beta-molecular sieve.The composite mould plate agent that CN1198404A adopts halogenide, tetraethyl ammonium hydroxide and the fluorochemical of tetraethyl ammonium to form under alkaline condition, make aluminium source, silicon source and crystal seed reaction crystallization produce beta-molecular sieve crystallization, the advantage of these inventions is that consumption of template agent is few, molecular sieve yield is high, cost is low.
The technology raw material of the synthetic beta-molecular sieve of more than announcing is all Chemicals, and this is also one of reason that its production cost is higher at present.There are in the last few years some technology take clay as all or part of raw material crystallization synthesis of molecular sieve, reduced the manufacturing cost of molecular sieve.The beta-molecular sieve that above-mentioned synthetic method obtains is elliposoidal.
EP0209332 discloses a kind of method with the synthetic Y zeolite of kaolin.Kaolin roasting is become to unbodied metakaolin, add a certain amount of water glass and sodium hydroxide, make gel.Conventional hydrothermal crystallizing is made Y molecular sieve.US3574538 and CN1533982A also disclose the method with the synthetic Y zeolite of kaolin, and the difference of itself and EP0209332 is to have added in synthesized gel rubber Y molecular sieve guiding agent.CN1334142A adds water glass after high-temperature roasting kaolin and metakaolin are mixed according to certain ratio, directed agents, and sodium hydroxide, water etc., it is 40% ~ 90% molecular sieve that conventional hydrothermal crystallizing obtains NaY content.
CN1736866A, take Coaseries kaolin as raw material, makes metakaolin through high-temperature roasting, then supplements silicon source and add a certain amount of inorganic directed agents, through hydro-thermal reaction, makes pure phase nanometer NaY big particle agglomerate.US4493902 will be mixed and made into slurries, the dry microballoon of making of spraying with hydrous kaolin after fine grain kaolin roasting, make hydrous kaolin be transformed into metakaolin through roasting, the raw material and the directed agents that add synthetic Y zeolite, stirring heating crystallization obtains NaY content and is at least 40% microspheroidal zeolite again.CN1334318A has directly carried out natural kaolin microballoon high temperature and middle temperature double roasting, then by roasting microballoon together with liquid phase component in alkaline system hydrothermal crystallizing, the microballoon obtaining all grows Y type molecular sieve at surfaces externally and internally.
It is the method that raw material has synthesized Y zeolite that CN1105647A discloses a kind of wilkinite.Wilkinite has adopted sulfuric acid acidation and solid sodium hydroxide alkali activation method simultaneously.US4091007 discloses the method that can keep extrudate shape while preparing type ZSM 5 molecular sieve and crystallization by prefabricated extrudate, and extrudate comprises silica source as the mixture of silicon sol and water glass, and the kaolin of 982.2 ℃ of calcinings.In crystallization process, use organic formwork agent.It is the method that raw material has synthesized Y zeolite that EP006817 also discloses a kind of kaolin.Inorganic acid example hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid etc. for metakaolin have been carried out acid treatment by this method.
Engelhard Corp of the U.S., has invented one and has utilized kaolin microsphere, and the method (CN1798608A) of the synthetic type ZSM 5 molecular sieve of Y zeolite crystal seed.Whole building-up process does not add template, not containing type ZSM 5 molecular sieve crystal seed.CN1803613A has announced a kind of method of preparing small-particle ZSM-5 molecular sieve, all or part of aluminium source is provided take the natural mineral such as perlite, polynite as raw material, add again silicon source, mineral acid, water and crystal seed mixed preparing reaction mixture gel, then conventional crystallization makes type ZSM 5 molecular sieve.
CN1559900A and CN1654330A have announced the method with the synthesising mesoporous MCM-41 molecular sieve of natural kaolin.
CN101108734A has provided and has destroyed one or more the method for the synthetic beta-molecular sieve of mixture in stone with perlite, kaolin, medical stone, polynite, wilkinite and coal.CN101723398A adopts HNO
3, CH
3cOOH and H
4one or more in EDTA are soaked polynites method activation polynite of roasting again, take TEAOH etc. as template, have synthesized small-particle beta-molecular sieve by the method for hydrothermal crystallizing.The method can cause a large amount of losses of aluminium and little to the activation of silicon oxide by acid soak, and how the acid solution after soaking is processed and is set forth, a large amount of spent acid solutions can be to environment, and this patent is not described the pattern of the beta-molecular sieve synthesizing, learn by analysis, the pattern of the synthetic beta-molecular sieve of the pattern of the beta-molecular sieve that the method synthesizes and general method is as good as, i.e. conventional ellipsoidal particle.
Summary of the invention
Main purpose of the present invention is to provide a kind of preparation method of square beta-molecular sieve, and the method, take more cheap, raw material sources natural mineral polynite widely as synthesis material, realizes the object of low cost synthesizing quadrate beta-molecular sieve.The invention provides a kind of high yield and produce the method for square beta-molecular sieve.
The method of the square beta-molecular sieve of preparation provided by the invention, comprises following process:
(1) polynite of activation treatment (MMT) is added in the template aqueous solution and carries out immersion treatment, the mass ratio of polynite and template is 1:1 ~ 1:10;
(2) in material in step (1), add silicon source, selectable aluminium source, alkali, water and template, be mixed to get gel masses, or template in this step replaces with beta-molecular sieve crystal seed, each component mole proportioning of gel masses is as follows:
SiO
2/Al
2O
3=10~400
Template/SiO
2=0.04 ~ 1.5 or input amount be the beta-molecular sieve crystal seed of gel volume 5% ~ 25%
M
2O/SiO
2=0.025~0.7
H
2O/SiO
2=10~30
Wherein M represents alkali metal sodium and/or potassium;
(3) gel masses step (2) being made is at 120 ~ 160 ℃ of hydrothermal crystallizing 20 ~ 200 h.
In the inventive method step 1, the method for polynite activation treatment comprises alkaline purification and high-temperature roasting.
Wherein the condition of alkaline purification is: with containing NaOH, Na
2cO
3, KOH, K
2cO
3with the solution soaking polynite of at least two kinds of materials in TEAOH, this solution journey alkalescence, this step is commonly referred to as alkali lye processing.In solution, the weight concentration of solute is 10wt% ~ 60wt%, preferably 20 wt% ~ 40 wt%; Soak time is 1 ~ 24 h, is preferably 1 ~ 5 h; Soaking temperature is 20 ~ 90 ℃, preferably 50 ~ 70 ℃; Liquid-solid ratio is (1 ~ 10) mL solution/1g polynite, preferably (3 ~ 6) mL/1g.After immersion, polynite washing is extremely neutral, it is for subsequent use that ovendry power is broken into small-particle, is preferably ground into after particle diameter is less than 70 μ m fine powders and uses to improve its reaction efficiency, more preferably polynite is processed into after particle diameter is less than 10 μ m fine powders and uses.Immersion alkali lye can reuse or silicon source, aluminium source join in the preparation of gel as a supplement.
Described roasting condition is: by the polynite after above-mentioned alkaline purification at 500 ~ 1300 ℃ of roasting 0.5 ~ 200 h, preferably at 700 ~ 1000 ℃ of roasting 1 ~ 10 h.Temperature rise rate when roasting is 1 ~ 10 ℃/min, preferably 4 ~ 8 ℃/min.
In the inventive method step 1, the condition of carrying out immersion treatment in the polynite of activation treatment and the aqueous solution that contains template is: immersion treatment 1 ~ 50 h, and preferably 5 ~ 30 h, soaking temperature is 20 ~ 90 ℃, preferably 40 ~ 70 ℃.Template aqueous solution weight concentration is 5 wt% ~ 60 wt%, preferably 15 wt% ~ 45 wt%.
In the inventive method step 2, mixture stirs again, mix, and it is concentrated by mixture at 20 ~ 90 ℃, to continue heated and stirred, is mixed with gel, and concentration time is 1 ~ 8 h.
In the inventive method, the polynite of activation treatment accounts for 20%～95% of He Zonglv source, total silicon source (in silicon-dioxide and aluminium sesquioxide total mass), is preferably 50%～70%.
According to method provided by the present invention, wherein said template can be a kind of or its several mixtures in tetraethyl ammonium hydroxide (TEAOH), etamon chloride (TEACl), tetraethylammonium bromide (TEABr) and tetraethyl ammonium iodide (TEAI); The crystal seed that the present invention drops into is the mother liquor that the synthetic beta-molecular sieve of hydrothermal crystallizing of the present invention filters gained.Described silicon source is one or more the mixture in the alkali lye used of White Carbon black, alkaline silica sol, water glass or tetraethoxysilance, activation polynite, is preferably White Carbon black or alkaline silica sol.
According to method provided by the invention, one or more in the alkali lye that wherein said supplementary aluminium source can be used for aluminium salt, aluminate, aluminum oxide, aluminium hydroxide, aluminium colloidal sol or containing aluminium zeolite, activation polynite, are preferably sodium aluminate.Because method provided by the present invention can provide synthesizing quadrate beta-molecular sieve required whole aluminium source by natural mineral polynite, so adding the amount in supplementary aluminium source when preparation reaction mixture gel can be zero.According to the component requirement of reaction mass, generally need to supplement silicon source, and aluminium source can supplement, or not supplement, aluminium source is to select raw material.
The crystallization product that the inventive method step 3 obtains, after washing and being dried, obtains square beta-molecular sieve.
Method provided by the present invention, wherein said hydrothermal crystallizing is that the reaction mixture gel being mixed with is carried out in pressure vessel under temperature constant state, i.e. thermostatic crystallization.Hydrothermal crystallizing can be that static crystallization, dynamic crystallization can be also intermittent type dynamic crystallizations.
The square beta-molecular sieve that the present invention is prepared take polynite as raw material, has following character: relative crystallinity is 70% ~ 90 %; SiO
2/ Al
2o
3mol ratio is 10 ~ 40; Grain-size is 70nm ~ 2000nm.From SEM pattern, crystal grain is most is square substantially.
The inventive method synthesizing quadrate beta-molecular sieve, can control by choosing the polynite of the different places of production, different qualities the chemical constitution of raw material according to actual needs.Raw material mineral not only provide the required aluminium source of synthesizing quadrate beta-molecular sieve that a part of silicon source is provided simultaneously, and the carrier of square beta-molecular sieve growth can also be provided.
Because the silicon oxide in polynite, aluminum oxide are in inert condition, and synthesizing quadrate beta-molecular sieve needs active silicon oxide, aluminum oxide, therefore before for the synthesis of square beta-molecular sieve, must carry out activation treatment to it, adopt activation method of the present invention effectively polynite to be activated, and make synthetic beta-molecular sieve there is novel square structure.
The object of polynite being carried out to alkaline purification is that the physical and chemical performance of polynite is changed, and strengthens the activity of its silicon oxide, aluminum oxide.Because polynite silicon oxide, aluminum oxide after soaking have started activation, skeleton has started loose, high-temperature roasting can further destroy skeleton in addition again, the activation degree of silicon oxide, aluminum oxide is further strengthened, method of the present invention activation method as compared with the past not only can reduce the loss of aluminium but also can reduce energy consumption, and reuses alkali lye environmental protection more.
Because square beta-molecular sieve is more tending towards generating powder in system, rather than be grown in the surface of polynite, thereby therefore for in-situ crystallization is realized on the surface that makes square beta-molecular sieve be grown in closely polynite; Also can further activate polynite, need to add heat soaking polynite with template solution simultaneously.
The product making according to the inventive method has X-ray powder diffraction (XRD) the feature spectrogram of beta-molecular sieve.In product, the content of square beta-molecular sieve (representing with relative crystallinity) and grain diameter can, by regulating the add-on of polynite and controlling with the ratio of silicon source, supplementary aluminium source, template in above-mentioned condition and range, also can be controlled by the treatment temp that changes polynite.Under normal circumstances, in crystallization product the content of square beta-molecular sieve between 30 wt% ~ 95 wt%.
For square beta-molecular sieve provided by the present invention, can also use conventional method to carry out modification.For example, can be by square beta-molecular sieve provided by the present invention by carrying out ion-exchange with acidic substance (as the aqueous solution such as ammonium nitrate, ammonium chloride), the square beta-molecular sieve of preparation H type.Square beta-molecular sieve provided by the present invention can be applied to Kaolinite Preparation of Catalyst, support of the catalyst, carrier or sorbent material.
In the inventive method, beta-molecular sieve crystal seed can adopt this area ordinary method preparation, also can adopt the mother liquor that filters gained after synthesizing quadrate beta-molecular sieve of the present invention is crystal seed, reduce like this usage quantity of template, thereby cost can be even lower, and mother liquor does not outwards discharge environmental protection more.
The preparation method of square beta-molecular sieve provided by the invention has following features:
1, provide silicon, aluminium source with natural mineral polynite, expanded the raw material range of synthesizing quadrate beta-molecular sieve, also reduced the raw materials cost of square beta-molecular sieve.
2,, by choosing the polynite raw material of suitable composition, can in the time of synthesizing quadrate beta-molecular sieve, directly bring the square beta-molecular sieve product that some particular requirement is usually prepared by some unit into.
3, dipping by lye is all activated silicon oxide, aluminum oxide and skeleton is looser, unit is more tiny, more be conducive to the formation of square beta-molecular sieve, alkali lye after immersion can be reused, also can be used as silicon source, the aluminium source of supplementing, sodium, potassium source join in the gel of synthesizing quadrate beta-molecular sieve, environmental protection more.
4, because the mother liquor to filter gained after synthesizing quadrate beta-molecular sieve also can synthesizing quadrate beta-molecular sieve as crystal seed, reduced the usage quantity of template, thereby cost can be even lower, and mother liquor does not outwards discharge environmental protection more.
5, owing to having carried out liquid concentration in the process of plastic, therefore improved the single-autoclave yield rate of molecular sieve.
6, because aluminium source in building-up process is to discharge from polynite, the formation of square beta-molecular sieve is occurred gradually, then in conjunction with controlling suitable material ratio and art breading, square beta-molecular sieve provided by the invention, grain-size is generally 70nm ~ 2000nm.
7, because this molecular sieve has the square pattern that is different from General Elliptic shape beta-molecular sieve, and have advantages of that outer surface area is large, diffusion long-range is short, voidage is high, intensity good, thereby can shorten reactant and product molecule improves catalyzed reaction efficiency in the path of molecular sieve intracrystalline diffusion.
Accompanying drawing explanation
Fig. 1 is X-ray diffraction (XRD) spectrogram of the synthetic square beta-molecular sieve of embodiment 3.
Fig. 2 is scanning electron microscope (SEM) figure of the synthetic square beta-molecular sieve of embodiment 3.
Fig. 3 is scanning electron microscope (SEM) figure of commercially available beta-molecular sieve (Catalyst Factory, Nankai Univ production).
Embodiment
Polynite claims again wilkinite, also claims montmorillonite, amargosite, otaylite etc., and the main chemical compositions of polynite is SiO
2and Al
2o
3, contain in addition the oxide compound of a small amount of calcium, magnesium, iron etc., it has special laminate structure and physicochemical property, and purposes is comparatively extensive.
The deficiency that the present invention is directed to patent CN101723398A is improved, and first processes polynite with alkali lye, has improved the activation degree to silicon oxide, aluminum oxide; Processing the alkali lye used of polynite can reuse, and alkali lye joins in the gel of synthesizing quadrate beta-molecular sieve because can be used as supplementary silicon source, aluminium source, sodium, potassium source containing activated silicon, aluminium, environmental protection more; This patent will be after synthesizing quadrate beta-molecular sieve separates the mother liquor obtaining as crystal seed synthesizing quadrate beta-molecular sieve again, both reduced template and usage quantity, reduced synthetic cost, again for the processing of mother liquor is found suitable approach, environmental protection more.
Below in conjunction with embodiment, the present invention is further detailed.
Relative crystallinity is in an embodiment to represent with percentage ratio at the ratio of the ratio of the peak intensity of the characteristic diffraction peak of 22.4 ° with 2 θ (2theta) of X-ray diffraction (XRD) spectrogram of products therefrom and beta-molecular sieve standard specimen.The beta-molecular sieve that comparison standard specimen adopts commercially available Catalyst Factory, Nankai Univ to produce, is decided to be 100% by its degree of crystallinity.
The X-ray diffraction spectrogram of products obtained therefrom gained on Rigaku D/max2500 type x-ray diffractometer in embodiment, diffraction conditions are Cu target, K α source of radiation, graphite monochromator, tube voltage 40 KV, tube current 80 mA, 0.1 ° of step-length.
In embodiment, the SEM picture of products obtained therefrom obtains in Japanese JSM-6301F type scanning electronic microscope, operating voltage 20 kV, operating distance 15 mm, resolving power 1.5 nm.
?
embodiment 1
Take commercially available polynite as raw material, get purify after polynite, according to the liquid-solid ratio of 10mL/1g, by polynite by NaOH, K
2cO
3, TEAOH form mixed ammonium/alkali solutions (NaOH, K in alkaline solution
2cO
3, TEAOH massfraction be respectively 15%, 10% and 5%) in soaking at room temperature 1 h, wash, be dried, be crushed to 7 μ m, with temperature rise rate 700 ℃ of roasting 4 h in retort furnace of 5 ℃/min, make activation polynite.
embodiment 2
Take commercially available polynite as raw material, get the rear polynite of purifying, according to the liquid-solid ratio of 10mL/1g, by polynite 50 ℃ of immersion 2 h in the mixed ammonium/alkali solutions being formed by NaOH, KOH, TEAOH (in alkaline solution, the massfraction of NaOH, KOH, TEAOH is respectively 10%, 5% and 5%), wash, be dried, be crushed to 10 μ m, with temperature rise rate 850 ℃ of roasting 2 h in retort furnace of 10 ℃/min, make activation polynite.
embodiment 3
By 30 g embodiment 1 activate polynite by 60 mL weight concentrations be 25 wt% tetraethyl ammonium hydroxide 60 ℃ soak 5 h.By sodium hydroxide 1.5 g, sodium-chlor 0.5 g, Repone K 1.5 g, distilled water 30 mL, concentration be successively afterwards 25 wt% tetraethyl ammonium hydroxide 40 mL, White Carbon black 30 g, drop into and at 70 ℃, stir 4 h in beaker and make mixture gel.Gel is proceeded to 140 ℃ of static crystallization 48 h in stainless steel cauldron.After crystallization finishes, cooling, filtration separates with mother liquor, washing, dry cake, obtains crystallization product.Through X-ray measuring, its thing belongs to beta-molecular sieve mutually, and the square beta-molecular sieve relative crystallinity in product is 80 %, and the crystal grain of molecular sieve reaches 80 ~ 120 nm.More than single-autoclave yield rate reaches 70 wt%.
embodiment 4
56 g embodiment 1 are activated to 50 ℃ of immersion 8 h of tetraethyl ammonium hydroxide that polynite 80 mL concentration are 25 wt%.Successively by heated and stirred 2 h in sodium hydroxide 2.5 g, sodium-chlor 0.4 g, Repone K 1.8 g, distilled water 40 mL, 25 wt% tetraethyl ammonium hydroxide 30 mL, White Carbon black 35 g, input beaker 90 ℃, make mixture gel afterwards.Gel is proceeded to 140 ℃ of static crystallization 48 h in stainless steel cauldron.After crystallization finishes, cooling, filtration separates with mother liquor, washing, dry cake, obtains crystallization product.Through X-ray measuring, its thing belongs to beta-molecular sieve mutually, and the square beta-molecular sieve relative crystallinity in product is 65 %.The crystal grain of molecular sieve reaches 80 ~ 160 nm.More than single-autoclave yield rate reaches 70 wt%.
embodiment 5
Be tetraethyl ammonium hydroxide soaking at room temperature 24 h of 30 wt% by 200 mL concentration by the polynite of 50 g embodiment 1 activation treatment.By sodium hydroxide 14 g, sodium-chlor 1.5 g, Repone K 3 g, distilled water 280 mL, concentration be successively afterwards 30 wt% tetraethyl ammonium hydroxide 100 mL, White Carbon black 170 g, drop in beaker heated and stirred 3 h at 75 ℃ and make mixture gel.Gel is proceeded to 120 ℃ of dynamic crystallization 96 h in stainless steel cauldron.After crystallization finishes, cooling, filtration separates with mother liquor, washing, dry cake, obtains crystallization product.Through X-ray measuring, its thing belongs to beta-molecular sieve mutually, and the square beta-molecular sieve relative crystallinity in product is 75 %.The crystal grain of molecular sieve reaches more than 200 ~ 500 nm single-autoclave yield rates reach 80 wt%.
embodiment 6
Be 40 ℃ of immersion 8 h of tetraethyl ammonium hydroxide of 15 wt% by 450 mL concentration by the polynite of 45 g embodiment 2 activation treatment.By sodium hydroxide 20 g, sodium-chlor 1.5 g, Repone K 5 g, distilled water 300 mL, concentration be successively afterwards 20 wt% tetraethyl ammonium hydroxide 200 mL, White Carbon black 200 g, drop in beaker heated and stirred 5 h at 55 ℃ and make mixture gel.Gel is proceeded to 150 ℃ of dynamic crystallization 84 h in stainless steel cauldron.After crystallization finishes, cooling, filtration separates with mother liquor, washing, dry cake, obtains crystallization product.Through X-ray measuring, its thing belongs to square beta-molecular sieve mutually, and the square beta-molecular sieve relative crystallinity in product is 80 %.The crystal grain of molecular sieve reaches more than 500 ~ 1000 nm single-autoclave yield rates reach 70 wt%.
embodiment 7
20 g embodiment 2 are activated to 50 ℃ of immersion 8 h of tetraethyl ammonium hydroxide that polynite 60 mL concentration are 25 wt%.Successively by heated and stirred 2 h in sodium hydroxide 3.0 g, sodium-chlor 0.5 g, Repone K 1.7 g, distilled water 45 mL, tetraethyl-bromine ammonium 15g, White Carbon black 35 g, input beaker 90 ℃, make mixture gel afterwards.Gel is proceeded to 140 ℃ of static crystallization 60 h in stainless steel cauldron.After crystallization finishes, cooling, filtration separates with mother liquor, washing, dry cake, obtains crystallization product.Through X-ray measuring, its thing belongs to beta-molecular sieve mutually, and the square beta-molecular sieve relative crystallinity in product is 78 %.The crystal grain of molecular sieve reaches 800 ~ 2000 nm.More than single-autoclave yield rate reaches 75 wt%.
embodiment 8
Be tetraethyl ammonium hydroxide soaking at room temperature 18 h of 20 wt% by 50 mL concentration by the polynite of 25 g embodiment 2 activation treatment.Afterwards successively by alkali lye 10mL, distilled water 50 mL, the mother liquor that β crystal seed 15mL(embodiment 7 filters of sodium hydroxide 1.5 g, activation polynite), White Carbon black 35 g, drop in beaker heated and stirred 1 h at 85 ℃ and make mixture gel.Gel is proceeded to 130 ℃ of static crystallization 84 h in stainless steel cauldron.After crystallization finishes, cooling, filtration separates with mother liquor, washing, dry cake, obtains crystallization product.Through X-ray measuring, its thing belongs to beta-molecular sieve mutually, and the square beta-molecular sieve relative crystallinity in product is 75 %.The crystal grain of molecular sieve reaches more than 700 ~ 1100 nm single-autoclave yield rates reach 70 wt%.
Claims (18)
1. a preparation method for beta-molecular sieve, is characterized in that comprising following process:
(1) polynite of activation treatment is added in the template aqueous solution and carry out immersion treatment, the mass ratio of polynite and template is 1:1 ~ 1:10;
(2) in material in step (1), add silicon source, selectable aluminium source, alkali, water and template, be mixed to get gel masses, or template in this step replaces with beta-molecular sieve crystal seed, each component mole proportioning of gel masses is as follows:
SiO
2/Al
2O
3=10~400
Template/SiO
2=0.04 ~ 1.5 or input amount be the beta-molecular sieve crystal seed of gel volume 5% ~ 25%
M
2O/SiO
2=0.025~0.7
H
2O/SiO
2=10~30
Wherein M represents alkali metal sodium and/or potassium;
(3) gel masses step (2) being made is at 120 ~ 160 ℃ of hydrothermal crystallizing 20 ~ 200 h.
2. method according to claim 1, is characterized in that: the method for polynite activation treatment comprises alkaline purification and high-temperature roasting.
3. method according to claim 2, is characterized in that: the condition of alkaline purification is, with containing NaOH, Na
2cO
3, KOH, K
2cO
3with the solution soaking polynite of at least two kinds of materials in TEAOH, i.e. alkali lye processing.
4. method according to claim 3, is characterized in that: in solution, the weight concentration of solute is 10wt% ~ 60wt%, preferably 20 wt% ~ 40 wt%.
5. according to the method in claim 2 or 3, it is characterized in that: the soak time of alkaline purification is 1 ~ 24 h, be preferably 1 ~ 5 h.
6. according to the method in claim 2 or 3, it is characterized in that: the soaking temperature of alkaline purification is 20 ~ 90 ℃ preferably 50 ~ 70 ℃.
7. according to the method in claim 2 or 3, it is characterized in that: the liquid-solid ratio of alkaline purification is (1 ~ 10) mL solution/1g polynite, is preferably (3 ~ 6) mL/1g.
8. method according to claim 2, is characterized in that: the polynite after alkaline purification is at 500 ~ 1300 ℃ of roasting 0.5 ~ 200 h, preferably at 700 ~ 1000 ℃ of roasting 1 ~ 10 h.
9. method according to claim 1, it is characterized in that: the condition of carrying out immersion treatment in the polynite of activation treatment and the aqueous solution that contains template is: immersion treatment 1 ~ 50 h, preferably 5 ~ 30 h, soaking temperature is 20 ~ 90 ℃, preferably 40 ~ 70 ℃.
10. method according to claim 9, is characterized in that: template aqueous solution weight concentration is 5 wt% ~ 60 wt%, preferably 15 wt% ~ 45 wt%.
11. methods according to claim 1, is characterized in that: the polynite of activation treatment accounts for 20%～95% of He Zonglv source, total silicon source, is preferably 50%～70%, and He Zonglv source, total silicon source is in silicon-dioxide and aluminium sesquioxide total mass.
12. methods according to claim 1, is characterized in that: the template described in step 1 and step 2 is a kind of or its several mixtures in tetraethyl ammonium hydroxide, etamon chloride, tetraethylammonium bromide and tetraethyl ammonium iodide.
13. methods according to claim 1, is characterized in that: beta-molecular sieve crystal seed adopts the synthetic beta-molecular sieve of hydrothermal crystallizing to filter the mother liquor of gained.
14. methods according to claim 1, is characterized in that: silicon source is one or more the mixture in the alkali lye used of White Carbon black, alkaline silica sol, water glass or tetraethoxysilance, activation polynite.
15. 1 kinds of square beta-molecular sieves.
16. square beta-molecular sieves according to claim 15, is characterized in that: the relative crystallinity of square beta-molecular sieve is 70% ~ 90%, SiO
2/ Al
2o
3mol ratio is 10 ~ 40.
17. according to the square beta-molecular sieve described in claim 15 or 16, it is characterized in that: square beta-molecular sieve grain-size is 70nm ~ 2000nm.
18. according to the square beta-molecular sieve described in claim 15 or 16, it is characterized in that: square beta-molecular sieve crystal grain is most is square substantially.
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| CN105540605A (en) * | 2014-10-30 | 2016-05-04 | 中国石油化工股份有限公司 | Aluminum-rich Beta Zeolite synthesis method |
| US10287172B2 (en) * | 2014-11-19 | 2019-05-14 | China University Of Petroleum-Beijing | Preparation method for beta zeolite |
| CN109911913A (en) * | 2019-04-18 | 2019-06-21 | 南开大学 | Prepare the method and BEA type molecular sieve of BEA type molecular sieve |
| CN110668459A (en) * | 2019-10-25 | 2020-01-10 | 吉林大学 | Nano Beta molecular sieve with wider silicon-aluminum ratio range and preparation method thereof |
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| CN101108734A (en) * | 2006-07-19 | 2008-01-23 | 中国石油大学(北京) | Beta type molecular sieve and method of manufacturing the same |
| CN101723398A (en) * | 2008-10-28 | 2010-06-09 | 中国石油化工股份有限公司 | Method for synthesizing granular beta molecular sieve with montmorillonoid |
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| CN101108734A (en) * | 2006-07-19 | 2008-01-23 | 中国石油大学(北京) | Beta type molecular sieve and method of manufacturing the same |
| CN101723398A (en) * | 2008-10-28 | 2010-06-09 | 中国石油化工股份有限公司 | Method for synthesizing granular beta molecular sieve with montmorillonoid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105540605A (en) * | 2014-10-30 | 2016-05-04 | 中国石油化工股份有限公司 | Aluminum-rich Beta Zeolite synthesis method |
| CN105540605B (en) * | 2014-10-30 | 2017-08-22 | 中国石油化工股份有限公司 | A kind of method of synthesizing aluminum-enriched Beta zeolites |
| US10287172B2 (en) * | 2014-11-19 | 2019-05-14 | China University Of Petroleum-Beijing | Preparation method for beta zeolite |
| CN109911913A (en) * | 2019-04-18 | 2019-06-21 | 南开大学 | Prepare the method and BEA type molecular sieve of BEA type molecular sieve |
| CN110668459A (en) * | 2019-10-25 | 2020-01-10 | 吉林大学 | Nano Beta molecular sieve with wider silicon-aluminum ratio range and preparation method thereof |
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